Question

Mr. Jones got his car washed at super clean. The wash started at 1:55pm and ended at 2:05pm. It cost $7. Mr. Smith got his car washed at Super Clean for $12. the wash started at 9:30am and ended at 9:50 am. Write an equation for the line that represents this situation.

Part 2: Use the equation to figure out the cost of Mr. Blie car washed in 30 minute.
Please explain and show work.